56855581 has 16 divisors (see below), whose sum is σ = 62576640. Its totient is φ = 51453360.

The previous prime is 56855567. The next prime is 56855641. The reversal of 56855581 is 18555865.

56855581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56855581 - 2¹⁹ = 56331293 is a prime.

It is a super-2 number, since 2×56855581² = 6465114181695122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56855501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48306 + ... + 49468.

It is an arithmetic number, because the mean of its divisors is an integer number (3911040).

Almost surely, 2^56855581 is an apocalyptic number.

It is an amenable number.

56855581 is a deficient number, since it is larger than the sum of its proper divisors (5721059).

56855581 is a wasteful number, since it uses less digits than its factorization.

56855581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its digits is 240000, while the sum is 43.

The square root of 56855581 is about 7540.2639874211. The cubic root of 56855581 is about 384.5248109359.

It can be divided in two parts, 5 and 6855581, that added together give a palindrome (6855586).

The spelling of 56855581 in words is "fifty-six million, eight hundred fifty-five thousand, five hundred eighty-one".